Our cabins toilet venting is not working. How do I install a new vent to an exsisting but maybe not installed correctly bathroom plumbing system?

I can tell you how a typical bathroom's laid out (see following)

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Most bathroom groups are roughed in like this.
Toilet connects to sewer main or the stack vent. Lavatory connects to toilet drain and runs a vent off the top the stubout tee out the roof or revents back into a dry vent in the attic.. The toilet wet vents through the lavatory vent and the tub/shower connects to the lavatory drain and is wet vented by it. This is a normal rough in and is acceptable both by local and state codes and also The Standard Plumbing Code Book in 90 percent of the country. Check your local codes to make sure you're not in the excluded 10 percent.. The vent off the lavatory may be run out the roof or revented back into a dry vent in the attic or if you're reventing back into a fixtures dry vent you must make your connection at least 6 inches over that fixtures flood rim.

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. To make corrections in your DWV system In need to know exacgtly what your lay out is. Can you furnish me with your current layout? Regards, Tom

When you say that the vent is "....not working properly..." What do you mean ? Can you be more descriptive and tell us how you came to this conclusion ?


It is usually sign of clogged toilet. You may have something lodged right inside the china bowl, or at the closet ring ( where toilet meets the floor). Get 5' auger tool from Home Depot and "snake" the bowl. Also, you may try ordinary rubber plunger.

Yes, vents are important part of plumbing installations. But, if it was a vent problem, than you would have the same problem for entire 2 3/4 years of ownership...